Multiplus II and Victron EV charger stopping

I have 2 x MultiplusII in Parallel, (48/5000) so a total of 8kw continuous, 12kw surge. Victron EV charger.

So with the EV in Manual charge pulling 4kw, house drawing 1.2kw for a total of 5.2kw relatively stead, evening so Solar is not an issue, battery 75kw at 92% SOC.

I turned on the 2400w kettle, which would have been 7.6kw total load, which it was for about 20 seconds, then the EV was shut off by the system. As it was in manual it did not restart.

The only assistant in the MPII is for the AC coupled PV, its set as stand alone, no grid or generator. The cerbo GX shows the EV connected and a modbus link is established. MPII firm 556, EV 2.01, and Cerbo GX is Firm V3.64.

Can any one shed some light on why this is happening, and what settings I need to look at?

Kettle done, I gave it 10 min it did not restart, so I manually restarted it and it still running 43min later.